Striking and chiming clock



Sept. 1871923. 1,468,267 i C. F. JOHNSTON ET AL STRIKING AND CHIMING CLOCK Filed July 2, 1921 3 Sheets-Sheet 1 lnvenzora Cy/f/ F Johnston; Harry A/. Wo/ford attorney Sept. 18, 1923. 1,468,267

' C. F. JOHNSTON ET AL STRIKING AND CHIMING CLOCK Filed July 2. 1921 3 Sheets-Sheet- 2 Attorn e y Sept. 18 1923.

1,468,267 C. F. JOHNSTON ET AL STRIKING AND CHIMING CLOCK Filed July 2. 1921 3 Sheets-Sheet 3 Inventors C yr'i/ l7 Johnston Atto ney Patented Sept. 18, 1923.

UNITED STATES CYRIL FREDERICK JOHNSTON AND HARRY NORMAN WALFORD, OF CROYDON AND PATENT OFFICE.

LEWISHAM, LONDON, ENGLAND.

"STRIKING AND Application filed m 2,

To all whom it may concern:

Be it known that we CYRLL FREDERICK JOHNSTON and HARRY ORMAN WALroRo, subjects of the King of Great Bri ain, and residents of Croydon, in the county of Surrey, and Lewisham, London, England, respectively, have invented certain new and useful Improvementsin-Strikinp and Chiming Clocks, of which .the fol owing is a specification. v

This invention relates to striking and chiming and like clocks and it has for its object to simplify the construction of such clocks by dispensing with oneof the usual sets of train gear. I p

In clocks as now constructed separate train gears are provided to perform separate functions for example inolocks which are adapted to strikeboth the hours and the quarters there are provided three, sets of train gear, one being for the time another for the hour striking and the third for the quarter chiming. y

By means 0 this invention one of these sets of train gear is dispensed with by adapt- I ing one of the remaining two sets toperiodically perform the functions of the third.

The invention therefore consists broadly of a striking and the like clock wherein a driven trainof wheels having one primary function is adapted to be connected and disconnected periodically to perform another or. other secondary functions.

According to one embodiment of the invention the ordinary hour striking train is used to operate the quarter chiming mechanism by means of a differential gear the two contrate gear wheels of which are connected to the chiming and striking gear respectively and are adapted to be alternatively locked against movement whereby the one set of train gear effects the operation of both the chiming and hour striking mechanisms.

In order that the invention may be clearly understood an embodiment of the same will now be described by the aid of the accompanying drawings in which 5- Fig. 1 is a perspective view looking towards'the front of the mechanism, parts not material to the proper understanding of the invention being omitted. v

Fig. 2 is a similar view lookingtowards the rear of the mechanism.

CHIMING CLOCK.

1921. Serial No. 482,021.

vation of a modification hereafter to be described, and

Fig. 3 is a longitudinal part sectional ele- Fig. 4 is a side elevation of a modification.

The embodiment of the invention illustrated in the drawings comprises a pair .of contrate spur wheels 1 and 2 loosely mounted upon an arbor or spindle 3 and operatively connected by means of one or more interposed pinions 4. These pinions are carried by a spider 5 which is fixedly secured to thearbor orspindle 3 so as to rotate therewith. V V

The contrate wheel 1 is adapted to operate the hour striking hammer '6 for which purpose the same is provided on its outside face with a plurality of spaced pins 7 which successively contact with a trip lever 8 which effects the striking movement of the hammer 6 in a well known manner.

These pins 7 also serve another purpose as will hereafter appear. I

The other contrate wheel 2 is connected to a drum 9 the periphery of which is provided with a plurality of predeterminedly spaced pins 10 which effect the tripping of the chiming hammers 11 in their proper order according to the arrangement of the notes as exemplified by the sound producing devices not shown.

The arbor or spindle 3 carries at one end a halfwheel 12 which is driven by the hour striking train of wheels referred to generally by the reference numeral 13 and thereby imparts the necessary rotational movement of the said arbor or spindle. I To effect alternate operation of the hour and quarter striking hammers it is necessary to lock one or other of the contrate wheels 1 or 2 against movement. For this purpose .is provided with a projecting pin 19 which periodically engages in a slot 20 cut in the periphery of a flange 21 of the contrate wheel 2 so as to similarly effect the locking of said contrate wheel 2 when the other con trate wheel 1 is free and vice-versa.

The rocking shaft 17 is operated by means of pins 22 carried at diametrically opposite points by a tooth wheel 23 the arbor Q4: of which carries the usual quarter chime controlling snail 25, through the medium of a pump lever 26 which is rigidly mounted upon the front end of said rocking shaft. In operation the rotation of the toothed wheel 23 causes the pin 22 to periodically engage the free end of the pump lever 26 thereby displacing said lever in one direction so as to move the rocking shaft 17 and bring the slot 18 in the end o1 the arm 1-1 into engagement. with one of the pins 7 for the purpose above mentioned. The continued movement of the pin allows the pump lever 26 to move inwards towards the arbor 24; by gravity thereby moving the pin 19, carried ly the other arm into engagement with the slot 20, the slotted arm 1% simultaneously moving out of engagement with the positioned pin 7.

In the modification illustrated in Fig. 3

the pinion or pinions of the differential are rigidly mounted upon radial spindles 27 which'in turn are revolubly mounted within hearings in a ring frame 28 which is secured upon the arbor or spindle 3.

From the foregoing description it will be understood that when the contrate wheel 1 is locked against movement the rotation of the arbor or spindle 3 is imparted only to the drum 9 which as a consequence operates the chiming hammers 11. Conversely when the contrate wheel 2 is locked against movement the rotation of the arbor or spindle 3 imparts motion to the eontrate wheel 1 which as a consequence operates the hour striking hammers 6. It will also be understood that the order of these operations is controlled by the position of the pins 522 which in turn are in predetermined relationship to the position of the usual hour and chime striking snails.

In the modification illustrated in Fig. 4 the spring drum 29 and fuses 30 are utilized to operate both the time and the hour chim ing gears for which purpose a differential gear is mounted upon the fuses arbor or spindle 31. The contrate wheel 32 of the differential is provided with a spur wheel 33 which drives a pinion 34; on the time spindle The other contrate wheel 36 is also provided with a spur wheel 37 which drives a pinion 38 mounted upon an arbor or spindle 39 which carries a disc 40 having a plurality of projecting pins 41 corresponding to the pins 7 in the other previously described examples and serving; to operate the hour striking hammer in a similar manner. The difl'erential pinion which meshes with the contrate wheels 32 and 36 is indicated at 42.

In this modification the time or hour strikingmechanism may be connected for operation by engagement with pins 41 of a lock lever as 14 in Figure 1, and the chime mechanism may be locked by a lock device similar to arm 15.

hat we claim and desire to secur by Letters-Patent is 1. The combination in a clock striking mechanism with a pair of trains each including a driven gear, of a differential pinion and its driving spindle for operating said trains, a periodically movable rock shaft and lock arms thereon for selectively engaging said trains whereby one train is held while the other train is'actuated.

2. The combination in a clock striking mechanism with a driving spindle and differential pinion thereon, of a chime actuating drum loose on the spindle and provided with a gear, a striking trip wheel loose on the spindle and prm'ided with a gear at theopposite side of the differential pinion, a periodically movable rock shaft, and lock arms on said shaft for selectively engaging said drum and trip wheel whereby one is held while the other is actuated.

In witness whereof we afiix our signatures.

oven FREDERICK JOHNSTON. HARRY NORMAN WALFORD. 

